Padlock.



B. B. STONE.

PADLOGK. APPLIOATION HLD PEB. 9, 1909,.

Patented Apr.- 13, 1909.

THE NoRRrs Pzrsks ca.. wAsmNcroN. D. c.

UNITED STATES PATENT OFFICE..

ELlNIER-B. STONE, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE CORBINCABINET LOCK COMPANY, OF NEW BRITAIN, CONNECTICUT, A CORPORATION OFCONNECTICUT.

PADLOCK.

No. 917,810. Specification of.' Letters Patent. Patented April 13, 1909.

To all whom it may concern: l secure. To that end, I provide in thatside Be it known that I, ELMER B. STONE, a 1 of the padlock body, inwhich the pin tumcitizen of the United Stateshresiding at New i blerbores are formed, an undercut recess, as Britain, Hartford county, Stateof Connectil best seen in Figs. 2 and 4. I then provide a cut, haveinvented certain new and useful l closure which has a flared lowerportion and Improvements in Padlocks, of which the foll which, when itis in its final position in said lowing is a full, clear, and exactdescription. i recess, stands under the undercut wall en- This inventioninvolves an improvement in padlocks particularly of the type set forthin United States Letters Patent No. 864,743,

dated August 27th, 1907, and the object of the present invention is toprovide an absolutely secure means for holding permanently in placecertain internal parts.

ln the drawings, Figure 1 is a vertical sectional view of a padlockconstructed to embody my invention, said parts being shown in elevation,and finally assembled, with key in place. Fig. 2 is a similar view justbefore the parts are finally assembled, and minus the key. Fig. 3 is ahorizontal cross-section on the line :c-x Fig. 1 looking down, certainparts being in elevation. Fig. 4 is a similar view on the line y-fy Fig.2, looking down. Fig. 5 is an edge elevation of the completed padlock.Fig. 6 illustrates a side and end elevation of a detail, before beingassembled with the other parts.

It will be unnecessary to describe in detail the main features ofconstruction since they correspond to the similar parts shown anddescribed in the above entitled application. The main features comprisethe case 1; the spring actuated hasp 2; the locking boltS therefor; thespring 4 for the locking bolt, the bolt operating device 5, which is inthe form of a key-plug which is locked by spring pressed pin tumblers 6.

7 is a key.

The pin tumblers 6 have the usual followers 8. The bores for thepin-tumblers are formed from one side edge of the lock case 1. The borefor the bolt operating device 3 is referably formed in the same side ofthe ook body so that a closure 9 will serve to cover all bores. In theconstruction shown in the patent above referred to, the closure forthese corresponding bores may become loose or may be driven out. Thepresent invention comprehends a construction by which this closure maybe made absolutely tirely around said recess.

The closure 9, before it is applied, is in the form shown in Fig. 6 inwhich it is bent as shown so as to foreshorten it in length and breadth,whereby it may be freely slipped into the aforesaid undercut recess, asshown in Fig. 2. Preparatory to this, all of the parts should of coursebe inserted and as a final step the closure 9 is placed in the positionshown in Fig. 2. rl'hen, by means of a suitable tool, said closure isstraightened out or flattened down to assume the position shown in Fig.1, whereby its edges are forced out into hrm and positive engagementwith the surrounding undercut wall of the recess. This forcing down ofthe closure 9 may be followed by a suitable finishing operation whichwill practically obliterate any line of demarcation showing where theplate has been inserted; assuming, of course, the material of theclosure 9 corresponds in color to the material of the case 1, or if not,this line of demarcation can be obliterated by the application of asuitable finishing preparation, suoli as enamel or in deed electroplating. Inasmuch as the recess is surrounded by an unbroken wall, theclosure can not be removed except by practically destroying the padlock.

What I claim is:

In a padlock, a body, a hasp, locking mechanism for said hasp containedin said body and including a bolt for the hasp, bolt operating means anda tumbler, said body having bores entering the side to admit the boltand tumbler, said body also having a recess in its side around saidbores and an unbroken undercut wall surrounding said recess, a closurein said recess, the edges of said closure projecting under the edges ofsaid undercut wall.

ELMER B. sToNn.

I'itnesses JOHN BLAIR, CARL F. ANDERSON.

